[edk2-devel] [PATCH] ArmPkg/ArmSoftFloatLib GCC4x: fix build failure

[Ard Biesheuvel]

On Fri, 31 May 2019 at 23:12, Leif Lindholm <leif.lindholm at linaro.org> wrote:
>
> On Fri, May 31, 2019 at 11:01:15PM +0200, Ard Biesheuvel wrote:
> > The upstream SoftFloat code that was recently incorporated into
> > ArmSoftFloatLib uses some parameterization to tweak the inlining
> > and optimization behavior for different compilers.
> >
> > The custom platform.h file that sets these parameters is based on
> > the upstream version for Linux/ARM, but was updated to include the
> > 'always_inline' GCC attribute into the INLINE macro, to ensure that
> > all definitions that are marked as inline are not only inlined into
> > their callers, but also to ensure that no version of the function
> > is ever emitted into the object file.
> >
> > This works fine on recent GCC and Clang, but the latter part turns
> > out to break on GCC 4.x, resulting in duplicate definition linker
> > errors. Fortunately, the synticatically more appriopriate 'static
> > inline' works fine on both the recent and the older compilers, so
> > let's switch to that instead.
>
> Oh yeah, I knew that, and completely missed it when reviewing.
>
> This behaviour hasn't actually changed substantially in later versions
> of GCC. I bet all that's saving us there is LTO :)
>

Not sure. LTO is disabled entirely for this library, since it
interoperates poorly with intrinsics.

> > Cc: Laszlo Ersek <lersek at redhat.com>
> > Cc: "Gao, Liming" <liming.gao at intel.com>
> > Cc: "Wang, Jian J" <jian.j.wang at intel.com>
> > Cc: Leif Lindholm <leif.lindholm at linaro.org>
> > Cc: Michael D Kinney <michael.d.kinney at intel.com>
> > Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
>
> Reviewed-by: Leif Lindholm <leif.lindholm at linaro.org>
>

Thanks

Pushed as 8594c2073cdb..371e7001e8d5


> > ---
> >  ArmPkg/Library/ArmSoftFloatLib/platform.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/ArmPkg/Library/ArmSoftFloatLib/platform.h b/ArmPkg/Library/ArmSoftFloatLib/platform.h
> > index 31e843463a38..07800a9d5b79 100644
> > --- a/ArmPkg/Library/ArmSoftFloatLib/platform.h
> > +++ b/ArmPkg/Library/ArmSoftFloatLib/platform.h
> > @@ -5,7 +5,7 @@
> >   */
> >
> >  #define LITTLEENDIAN 1
> > -#define INLINE inline __attribute__((always_inline))
> > +#define INLINE static inline
> >  #define SOFTFLOAT_BUILTIN_CLZ 1
> >  #define SOFTFLOAT_FAST_INT64
> >  #include "opts-GCC.h"
> > --
> > 2.20.1
> >

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